Stone-turning lathe



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STONE TUNNING LATEN.

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STONE TURNING LATER.

15,274,563 Y y P tema Mam?, 188s.

1kb/ENTER UNITED STATES PATENT OFFICE.

THOMAS F. GLEMONS, OF TIVEBTON, COUNTY OF DEVON, ENGLAND, AS- SIGNOR TO A. C. BALDWIN, OF BOSTON, MASSACHUSETTS.

Y STONE-TU RNING LATH E.

'PEOIFICATION forming part of Letters Patent No. 274,563, dated March 27, 1883.

Application filed December 4, 1:382.` (No model.)

being had to the accompanying drawings, and.

' to the letters and iigures of reference marked thereon, which form a part of this specification. i

My invention relates to improvements in guides or pattern-plates for lathes for turning tapers or forms in stone columns or other material, and is designed as an improvement on the machine shown in Letters Patent No. 265,581, dated October 10,1882, granted to E. R. Cheney.

The object of my invention is to control both cutter-heads by a single guide or pattern bar running longitudinally through thecenter of the lathe-bed, said bar being made adjustable, so as to give to the column any desired shape or taper. A

My invention consists in an adjustable cen` trai guide-or pattern bar, to which the cuttercarrying frames are movably secured by a slotted hanger which is carried along by the cntter-carrying frames, whereby the cutters are automatically moved toward or from the stone to giveto the stone the required taper orshape.

My invention consists, further, in certain details of construction hereinafter more fully set forth, and pointed out in the claims.

Figure l is a side elevation of a portion of a stonelathe, showing a column and automatic feed device for the cutters and cutter-carrying frames which I prefer to use. Fig. 2 is a longitudinal sectional view, showing the guide or pattern bar. Fig. 3 is a cross-section on the line :c m of Fig. 2. Fig. 4 is aplan view. Fig. 5 is a sectional view of a portion of the guide or pattern bar partly in section. Fig. 6is a transverse vertical sectional view on the line of Fig. 5.

In the patent to Cheney, above referred to,

a pattern device is shown consisting of three the cutter-heads toward or from the stone and giving the required shape to the columns. The said bars or pattern-surfaces, bein g firmly bolted inside of the lathe-bed, were only capable of forming one shape or pattern of column This, in case of a great variety of column shapes boingl needed, necessitated the employment ot' one or more skilled workmen in making pattern-surfaces. The lathebed and appliances for revolving the material, as wellas for feeding the mechanism to the material to be operated upon, together with the chucks for holding the material, the cutters, and cutter-holders, form no part of my invention, and consequently a full detailed description -of these parts is deemed unnecessary, and only so much will he described as will be necessary to describe my improvements as applied to the class of lathe-beds shown in the drawings.

A is a lathe bed or frame provided with the usual chucks for holding the material to be operated upon, and with mechanism for irnparting motion thereto. The lathe-bed is pro vided with a sliding plate, B, which is connected at both ends to operating mechanism Aby a pendant or arm, a, which embraces the grooved rods or shafts af. The pendant a is provided with a gear-wheel, b, which engages with a worm wheel or gear, b', on the shaft or grooved 'rods a. rlhe worm wheel or gear b is located within the arms c c of the pendantl a, and is provided with a tongue for engagement with the grooves in the rods or shafts a. The shaft c', on which the gear-wheel is mount ed, is provided 'with a small Vpinion-wheel, d, (shown in dotted lines in Fig. 1,) which meshes with a gear-wheel, d', mounted on a shaft, e, which has its bearing in the pendant a. The inner end of the shaft `c is provided with a gear-wheel, c', which meshes with the rack f on the lathe-frame, so that by the rotation of the shafts or rods a the plate B is caused to travel back or forth on top of the lathe-bed.

C C are the cutters, secured to appropriate axes, and mounted on adjustable beds D D in such ay manner that the cutters may be IOG turned to any desired an gie or moved back and forth, to and from the stone, in ways in the plate D, provided for that purpose, as shown at g, Figs. 1 and 2.

I have given this detailed description of the feeding and adjusting mechanism for the purpose of more clearly illustrating myinvention; but these devices form no part of my invention.

E E are guide or pattern bars adjustably secured to the central portion of the lathe-bed A. These. guide or pattern bars are provided with a flanged upper surface, for a purpose which will be more fully hereinafter explained.

As above stated,the pattern-bars are adjustably secured to the base A by means of slots h and screw-bolts 71.', by which means the bars are capable of longitudinal adjustment. The bars E E are beveled at their inner ends, as shown ati in Figs. 2 and 5, so as to form a V-shaped recess, i. The inner ends of the bars E E are coupled together by means of a iight and left hand screw bolt, F, which meshes with appropriate screw-th reads or nuts secured in the cavities k in the ends ofthe bars E E, so that by loosening the bolts h and turning the screw-bolt F the inner ends of the bars E E may be raised or lowered to any desired angle within prescribed limits, in which position they may be secured by tightening` up the bolts h.

G is a hanger, which is loosely connected to the arm H of the cutter-carrying beds D by means of adiagonal slot, m, in the hanger,

I and a headed pin, m', with friction-roll secured to the arm H and adapted to move back and forth in the slot m. The lower part ofthe hanger G is bifurcated or provided with hooks whichproject under the head I of the bars E, so as to support and steady the hanger G. The hanger G is also provided with a frictionwheel,o, which rests upon the top of the bar E, so that the hanger will more readily move back and forth on the bar E. The hangers G are also provided with side lugs, s, in which are formed the slots t for thereception of the bolts u, (see dotted lines in Fig. 3,) by which means the hanger is secured firmly as against lateral displacement, while at the same time it is'free to move up and down in a vertical line.

clined portions of the bars, is pushed up, and

by means of the pin. fm', working in the slot m, the cutter-carrying bed D is forced from the stone, carrying with it the. cutters, and thus the desired depth of cutis given to the cutters, and columns of varying peripheraloutline may be formed with ease and without the aid of an attendant to watch the pattern-bars, and, furthermore, one set of pattern-bars is all that is necessary to produce a variety of tapers or forms in the article to be turned.

Having thus described my invention, what 1 claim, and desire to secure by Daetters Patent, 1s

1. In lathes for turning tapering columns or shapes of stone or other material, a central guide or pattern bar, the pitch of the incline of which is vertically adjustable, said bar being connected to the cutter-carriage by means of vau adjustable arm havingaslot therein, the pitch or angle ot which slot determines the taper or peripheral outline of the article to be shaped, as set forth. 2. The guide or pattern bars herein described, adjustably connected to the frame of the machine at their outer ends, said bars being beveled at their inner ends, and connected to each other by a right-andlefthand screw-bolt, by means of which the abutting ends of the bars are raised or lowered, as set forth.

3. The combination of the adjustable guide or pattern bars E E and slotted hanger Gr, movably connected to said pattern-bars, and adapted to travel back and forth thereon, with the arm H audcutter-carrier D, as set forth.

In testimony whereofI ax my signature in presence of two witnesses.

THOMAS F. oLEMoNs.

Witnesses:

ARNOLD A. RAND, EDWARD J. J oNEs. 

